Coke oven



May 19, 1931. J. VAN ACKEREN COKE OVEN Filed June 21, 1926 2 Sheets-Sheet 1 INVENTOR.

* ATTORNEYS.

WASTE OUTFLOW COKE q-As WATER ens y 1931. J. VAN ACKEREN 1,806,134;

' COKE ovnn Filed June 21, 1926 2 Sheets-Sheet 2 EN TOR.

I g. :ATTORNEYS.

Patented May 19, 1931 uairso sTAT PAT NT orr cs JQSEPH VAN AGKER-EN, 'OF PITTSBURGEI, PENNSYLVANIA, AS'SIG-NOR TO THE KOlPPERS COMPANY, OF PETTSBURGH, PENNSYLVANIA, A GGRPOEATION 9F PENNSYLVANIA COKE OVEN Application filed June 21,

My invention comprehends broadly certain improvements of general utility in' the coke oven artand in its more specific aspects relates to the generation, separation and utilization of gases produced in the coking chain bers of vertical retorts. The subject matter of this application is broadly related to that of my former applications, Serial llo. 6845,3d2, filed January 4, 1924, and Serial Nos. 1,717 and 1,718, filed January 12, 1925, of which applications my present application is continuation in part. i V

The'gas of distillation taken off the fresh coal in systems of the character indicated is rich in B. t. u. value and since most of the municipalities of this country require that the gas sold to the public be of such character it has high commercial value which has led to the discontinuance of its use, so far as practicable, in firing the heating walls or the retorts in order that it may be saved for sale, a cheaper andleaner gas, such as producer gas. being usually employed to fire the retort valls. This, however, ordinarily requires the construction and operation of a so-callcd producer, the gas from which by reason of its high nitrogen content must of necessity be preheated in the regenerators before it can be burned; This adds materially to construction and operation costs. i

My present invention contemplates dispensing with the necessity for a separate producer and generating the necessary auxiliary for heating the fined walls in the oven chambers -.hemselves. I am thereby enabled not only to materially reduce construction and operation costs but also to preserve the major portion of the valuable gases of distillation for sale. These results I accoin plish by introducing into the portion of the oven chambers below their tops which is occupied by incandescent coke, a medium which will react with the heated coke to generate a combustible gas which is removed from the oven chambers at a point below that at which the gases of distillation are: primarily released and removed. I may, for instance, introduce steam into the region of incandescent col-re and remove therefrom the resultant water which is itself of fairly high B. t. n.

1926. Serial No. 117,216. b

7 value and does not require'preheati-ng before its introduction into the fined heating walls;

This gas as it is takengfrom the ovenis preferably passedthrough coolers to reduce its temperature and from" thence it is led through suitable piping to the fined heating walls, a portion p-referably'being passed to a suitable reservoir to equalize the pressure on and thus to stabilize the operation of the flues. 'VVhere the gases of distillation are higher in B. t. u. value thanis necessary a regulated portion of the Water gas may be allowed to ascend to the top of the oven chamber and mix therewith in the, necessary proportion to give the resultant 'qualityof gas desired. For the production of the desired quantity of water gas I prefer to utilize steam which has been employed'to cool the coke in the extractor magazine, supple-. mented by additional steamas may be necessary.

It will be obvious thatto decompose the steam into water gas in the region of the in candescent coke in the oven chamber While at the same time maintaining coking temperature there necessitates the supplying from the adjacent region of the oven Walls heat additional to that required for 'completing the coking and this in turn necessi-, tates regulation of the combustion in this region of the wall fines to supply the proper total amount of heat required for both purposes.

In systems that burn up and down and have separate regulators for each stageof combustion if it is desired to make an appreciable amountof Water gasiin the lower part of thec'oking chamber, requiring the addition of more heat to that part, there resultsan unbalancing of the system on reversals. The regenerator groups employed for preheating the combustible gases and airioo ously be true. It follows that the heat distribution of the system is totally unbalanced.

All these disadvantages are avoided by my system and I am able to obtain a balanced heating throughout, both on upflow and on quantity of heat requisite for proper coking and simultaneously that requisite for the decomposition of steam into water gas. More-- over, since I am able to maintain the distribution of the heat of combustion Ofthe heating walls the same on reversals and since the respective regenerator groups eachreceive in alternation the combined waste gases of combustion from both the upper and the lower stages. of the heating walls both groups are equally heated in alternationby said waste gases and my regenerator system is perfectly balanced on upfiow and on downflow.

It will be obvious that a battery embody ing my improvements is of great flexibility, being capable of operation either on coke oven gas alone introduced without preheating through the usual channels and nozzles in the bed of the oven or by water gas alone generated as above indicated which also needs no preheating and may be introduced through the same channels as the coke oven gas, or by a mixture of the two gases, and lastly it may be heated by producer gas or other extraneously derived gas, the latter being passed through appropriate regenerators to preheat the same.

. My invention further-consists in such other new and useful'improvements or advantages in construction and operation as are found to obtain in the structure and devices herein? after described or claimed.

WVhile, as a specific embodiment, I have disclosed the principles involved in myinvention applied to a continuous coking retort it will be obvious to those skilled in the art that they areapplicable to other coke ovenstructures or to other heat treating apparatus;

In the accompanying drawings forming a part of this specification and showing for purposes of exemplificationa preferred form and manner in which the invention-may be embodied and practiced, but without limiting the claimed invention specifically to such illustrative instance or instances: 1

Figure 1 is a vertical section transversely of the oven showing the application of my invention to a vertical retort. Fig. 2 is a front. elevation of the same, and Fig. 3 is a, composite horizontal section taken on different horizontal planes indicated by the lines A-A, 13-13 and CC respectively of Fig. 1.

The same characters of reference designate the same parts in each of the several views.

In the illustrated embodiment of the invention there is shown a vertical retort provided with the usual coking chambers 11 alternating with vertically fiued heating walls 12. At the base of each coking retort is located a coke extractor magazine 16 provided with suitable distillation. V

In order to independently regulate the temperature of the several zones of the oven chamber I preferably divide each flued heating wall into two stages, the upper comprising the flue sections 37 and the lower the flue sections 38 interconnected by the channels 40. The fines of the lower section at their lower end communicate by means of the ports 42 with the channel 43 which in turn communicates with the channel 44 passing around an oven chamber and constituting a flow connection between the lower end of the fines of one wall and the lower ends of the fines of the other wallon the opposite side of the oven chamber. Regenerators are shown at 45 provided with the usual checker-work 46, said regenerators being arranged in pairs communicati n g with individual. heating walls respec tively, as set forth more in detail in my application 684,342, supra. In accordance with this arrangement when operating on producer gas, the latter is introduced into'a heating wall through one regenerator of a pair, while air is introduced thereinto through the other regenerator of thesame pair in the same heating wall and the waste gases are removed through the fines of an opposite heating'wall and through the pair of regenerators connected thereto. lVhenfcoke oven gas is employed additional air replaces the producer gas of the former arrangement, thecoke oven gas being directly introduced into the flues through appropriate flues as hereinafter set forth. Referring to Fig. 3, if itbe assumed that the regenerator indicated P is operated to preheat gas and that indicated A to preheat'air the flow of air will be from A through the upper duct 53 to the horizontal flue 54 through the ports 55 into the tops of the upper flue sections 37 of the corresponding heatingwalls, and the flow of producer gas will be from regenerator P through the duct 63, the horizontal flue 64 and ports 65 into .85 main 21 for the removal of the rich gases of I ducer gas to the upper flue sections 37 are independently regulated by the respective sets of sliding bricks 69. In order to supply the lower flue sections 38 the ports 71 communicably connect the horizontal channel 5ft with the v rtical feed channels 72 located in the bottle bricks 73 and the ports 81 connect the horizontal channel 64} with the vertical tee chann l 82 simila y located. These erti al. e d chan ls comm ni at ough a ch duets 74 and Si with th tops of the low r flue sections 38- Th flow o a r through the vertical feed channels 72 and the flow of producer gas through the vertical feed channels 82 are independently regulated by the respective sets of sliding bricks '85 located in the horizontal fines 5 1 and 64, respectively, within easy reaehof the oven top,

In accordance with my invention the water gas generated by the reaction of steam on the incandescent coke is taken oif through the oiitake 19 and from thence is led through the pipe 86 to the cooler 87, from thence it is led by pipe 88, in which is located a pump .89, to a reservoir (not shown) and to branch pipes 9.0, 90 and 90. From the branch pipe 90 the gas is led through branches provided with regulating devices 91 to the channels 92 communicating with the upper ends of the upper.

flue sections 37 and from the branch pipe 90 gas is similarly led through regulating devices 93 to channels 95 communicating with the upper ends of the lower flue sections 38. The channels 92 and 95, also have connection (not shown) with the coke oven gas main or similar sources of supply whereby, when the water gas connections are shut 01f, the oven may be operated on coke oven gas or a mix.- ture of the two may be employed.

' In the operation of my oven the fined walls may be heated by the combustion of producer gas in the presence of air in the usual manner, both being preheated in their respective re-. generators, or I may alternatively introduce water gas generated in the oven itself as here, inbefore set forth through the channels 92 and 95, or as a still further mode of opera? tion I may shut off the latter supply from the channels 92 and 95 and introduce therein the coke oven gas itself, or again, I may use a mixture of the several gases in the proper-o tions desired. The introduction of steam into the incandescent region of the coking chamber for the production of water gas will obviously tend to reduce the temperature in that section of the oven, seriously interfering with the coking operation, and were it attempted to supply additional heat in all of the flues in order to maintain a coking temperature the heat generated in the upper flue sections 37 might be so great as to cause a cracking of the rich gases ofdistillation with its. wel nown at endant disa vantages, By

my sys em, howe r, I am abled to preserve the temperature of the region of the oven in which the gases of distillationfor th m part are gene a ed at the desir d mpe a ure to pr vent o a ing while at he same me I ay by n p d nt'ieg lao f the i'nfi ing gases n o the lower flue sections 38 increase the amount of the heat generated in said section'and thereby supply the addi o a h a requ ed n the innannies e t region of the c king ch ge to generate the water gas employed by me tovheat the ven a lst will. e efore be ob ious that my y' m'i of gr t si plieity an extr me ly flexible in use. 1 7

' he in ntion as reina ove set forth is embodied in a particular form ofconstruc- I tion, but may be variously embodied within the scope of the claims hereinafter made.

I la m:

1. In a vertical retort battery for the care bonization of coal, in combination: a plural.- ityof side-by-side continuous vertical coking chambers each adapted to receive through its top substantially continuously the charge to be coked and to discharge through its bottom substantially continuously the coked charge; heating walls therefor between'and contiguous to said coking chambers and respectively comprising vertical flame fines; regenerators communicably connected with the flame fiues of the respective heating W e ch of id hea ing wall having'it vertical flame fines disposed in upper and lower flue sections which respectively hiWe fuel gas conduits and airregenerator conduits, adapted forseparately regulating the heating of said sections so that the upper p rtion f h ok ng cha b rmay be reg ulably heated for coal gas production and the lower portions for water gas production,

and each of the heating walls having flow du ans, mmo to and in eo n iu i a i n with th flu ectionetor oinmingling and passing waste gases therefrom to said I en r d til t g s oifteke; means ooin nnni e y ne d wit the upner portions of said coking chambers for ofitake of coal-gases of distillation at the upper parts of said coking chambers; means for introduc= ing steam into the lower portions of said coking chambers for watergas production in the lower portions thereof; Wateregas offtake means communicab'ly connected'withthe coking chambers below said distillate-gas eff? take means and above said means for'intr-oi ducing steam, and adapted for offtake from said coking chambers, separately from and independently of gas oft-flow through the d t lat ge o teke means for the coking chambers, of water gas produced in the lower portions of said coking chambers from said steam; and means for leading watergas from said water-gas 'otftake means to the fuel .gas conduits ofatleast one of said upper spectively comprising vertical flame flues;

regenerators communicably connected with the flame flues of the respectlve-"heatmg walls; each of said heating walls hav ng its verticalflame flues disposed in upper and lower flue sections which respectively have rich fuel gas conduitsand' air regenerator conduits, adapted for separately regulating the heating of said sections so that the upper portionsof the coking chambers may be-regulably heated for coal gas production and the lower portions for water gas production, and each of the heating walls havingflow duct means common to and'in communication with both flue sections for commingling and passing waste gases therefrom to said regenerators; distillate-gas ofl'take means communicably connected with the upper portions of said coking chambers-for ofl'takc of coalgases of distillation at the upper parts of said coking chambers; means for introducing steam into the lower portions of said coking chambers for water gas production in'the lower portions thereof; water-gas ofl'take means communicably connected with the coking chambers below said'distillategas ofltake means and above said means for introducing steam, and adapted for ofltake from said coking chambers, separately from and-independently of gas off-flow through the distillate gas ofltake means for the coking chambers; of water-gas produced in the lower por tions of said coking chambers from said steam; and means for leading w1ter-gas from said water-gas ofltake means to the rich fuel gas conduits forsaidupp'er and lower flue sections of eachof the heating walls for com bustion'in the 'flues of said sections.

3. The combination as defined in claim 2 in which means are provided for cooling the water gas after it leaves the coking chambers and while being led to the rich fuelgas conduits so that'the water gas'may entersaid conduits and flues in-unpreheated condition.

4:. In-a vertical retort battery tor the carbonization of coal, in combination a plurality of side-by-side continuous vertical coking chambers each adaptedt-o receive through its top substantially continuously-the charge to be coked and to discharge through its bottom substantially continuously the coked charge; heating'walls therefor between and contiguous to said coking chambers V and respectively comprising vertical flame flues; regenerators commumcably connected wlth the flame 'flues of the respective heating walls; each of said heating walls having its vertical flame flues disposed in upper and means common to and in communication with both flue sections for comminghng and passing'waste gases therefrom to said regeneratfors; distillate-gas ofit'ake' means communicablyconnected' with theupper portions of said coking chambers for ofltake of coalgases of distillation at the upper parts of said I coking chambers; means for introducing steam into the lower'portlons-of said coking chambers for water gas productlon'in the lower'portions thereof; water-gas ofltake N means c-ommunicably. connected with the coking' chambers bclowisaid distillate-gas ofltakeimeans and above said means for introducing steam and adapted for olitake from said coking chambers separately from and independently of gas off-flow through the distillate gas ofl'take means for the coking chambers, ot water-gas produced in the lower portions of said coking chambers from. said steam; and means for leading water-gas from said water-gas oiitake means.

5. In a vertical retort battery for the carbonizationot coal in combination: a plurality of side-by-side continuous vertical'coking chambers each adapted to receive through its top substantially continuously the chargeto be coked and todischarge through its bot tom substantially continuously the coked charge; heating walls thereforbetween and contiguous to said coking chambers "and respectively comprising vertical flame =flues; regenerators communicably connected with the flame flues oi the respective heating walls; each of said heating walls having its vertical flame flues disposed in upper and lower flue sections whichrespectively have fuel gas conduits and airregenerator conduits, adapted for separately regulating the heating of said sections so that the upper portions .of the coking chambers may be regulablyheated for coal gas production and the lower por tions for production'of a leaner gas formed reaction of incandescent coke in said retorts with a fluid medium introduced therein, and each of the heating walls having flow duct means common to and in communication with both flue sections for commingling and passing waste gasestherefrom to'said regenerators; distillate-gas ofltake means communicably connected with the upper portions of said coking chambers for offtake or" coaliiio "ios

gases of distillation at the upper partsof said coking chambers; means for introducing a fluid medium into the lower portions of said coking chambers for reaction with in-' candescent coke therein to produce a leaner gas than coal gas in the lower portions of said coking chambers; lean gas offtake means communicably connected with the coking chambers below said distillate-gas oiftake means and above said means for introducing a fluid medium, and adapted for ofltake from said coking chambers, separately from and independently of gas off-flow through the distillate gas oiftake means for thecoking chambers, of leaner gas produced in the lower portions of said coking chambers from said fluidmedium; and means for leading lean gas from said lean gas oiftake means to the fuel gas conduits for said upper and lower flue sections of each of the heating walls for combustion in the flues of said sections.

6. In a vertical retort battery for the carbonization of coal, in combination: a plurality of side-by-side continuous vertical coking chambers each adapted to receive through itstop substantially continuously the charge to be coked and to discharge through its bottom substantially continuously the coked charge; heating walls therefor between and contiguous to said coking chambers and respectively comprising vertical flame flues; regenerators communicably connected with the flame flues of the respective heating walls; each of said heating walls having its vertical flame flues disposed in upper and lower flue sectionswhich respectively have fuel gas conduits for supply of coke oven gas and of water gasand a-ir regenerator conduits,"adapted forsepa-- rately regulating the heating of said sections so that the upper portions of the coking chambers may be regulably heated for coal gas production and the lower portions for water gas production, and each of the heating walls having flow duct means common to and incommunication with both flue sections for commingling and passing waste gases therefrom to said regenerators; distillate-gas offtake means communicably connected with the upper portions of said coking chambers for ofl take of coal-gas of distillation at the upperparts of said coking chambers; means for introducing steam into the lower portions of said coking chambers for water-gas production in the lower portions thereof; watergas ofltake means communicably connected with the coking chambers below said distillate gas ofitake means and above said means for introducing steam, and adapted for offtake from said coking chambers, separately from and independently of gas off-flow through the distillate gas ofltake means for the coking chambers, of water gas produced in the lower portions of said coking chambersfrom said steam; and means for leading water-gas from said water-gas ofitake means tospectively comprising vertical flame flues; re-

generatorscommunicably connected with the flame fines of the respective heating walls,

and arranged and adapted for respectively supplying preheatedair and producer gas or j'ointlysupplying preheated a ir; each of said heating walls having its vertical flame flues disposed in upper andlower flue sections which respectively have rich fuel gas condui-ts and regenerator conduits, adapted for separately regulating the heatingof said sections so that the upper portionsof the coking chamber'smay be regulably heated for coalgas production and the lowerportions for water-gas product-ion, and each of the heating walls having flow duct means common to and in communication with both flue sections for commingling and passing waste gases therefrom to said regenerators, and the regenerator conduits being arranged and adapted'for respectively supplying preheated air and gas or jointly supplying preheated air; 'distillate gas offtake means communicably connected with the upper portions of said coking chambers for ofitake of coal-gases of distillation at the upper parts of said coking chambers; means for introducing steam into the l'ower'portions of said coking chambers for water gas production in the lower portions thereof; water-gas o'fl'ta'ke means I communicably connected with the coking chambers below said distillate-gas offtake means and above said means for introducing steam, and adapted for ofli'take from said cok ing chambers, separately from and independ-,

gas ofit-ake means to the rich fuel gas conduit s for said upper and lowerfluesections of each of the heating walls for combustion v in the fines of said sections.

8-. In a vertical retort battery for the carboni-zation of coal,,in-combination: a plural ity of sid'e by-side continuous vertical coking chambers each adapted to receive-through its top substantially continuously the chargetobe-coked and to discharge through its bottom substantial-1 y continuously the coked charge; heating walls therefor between and chambers,'of water-gas produced in the lower" portions of said coking chambers from said contiguous to said coking chambers and respectively comprising vertical flame flues ;regenerators communlcably connected with the flame flues of the respective heating walls,

and arranged and adapted for respectively supplying preheated air and producer gas or jointly supplying preheated air ;each of said heating walls having its vertical flame flues disposed in upper and lower flue sections which respectivelyhave fuel gas conduits for supply of coke oven gas and of water gas, and regenerator' conduits, adapted for separatelyregulating the heating of said sections sothat the upper portions of the coking chambersmay be regulably heated for coal gas production and the lower portions for water gas production,- and each of the heating walls having flow duct means common to and in communication with both flue sectionsfor comminglingand passingwaste gases therefrom to said regenerators, and the regenerator conduits being arranged and adapted for respectively supplying preheated air and gas ,or jointly supplying preheated air;- distillat'e-gas offtake means communicably connected withthe'upperportions of said coking chambers for offtakeof coalgases of distillation at the upper parts 1 of said coking chambers; means for introducing steam int-o the lower portions of said cokingchambers for water gas production in the lower portions thereof; water-gas offtake means commumcably connected with the cokingchambers-below said distillate-gas off? take means and above saidmeans for introducing steam, and adapted for ofltake from said coking chambers separately fromand independently of gas off-flow through the distillate gas, offtake means for the coking steam; and means forleading water gas from said water-gas offtake means to the fuel gas condults for supply of water gas to saldupper and lower fiue sections of each of the heat-v ing walls for combustionv in the flues of said sections.

bonization of coal, in combination a plurality :of side-by-side continuous vertical coking,

chamberseach adapted to receive through its topsubstantially continuously the charge to be coked and to discharge-throughits bottom substantially continuously the coked 5 charge; heating walls therefor between and contiguous tosaid coking chambers and respectively comprising vertical combustion flues regener ators communicably connected with theflame flues of the respective heating walls; each of said heating .walls having its 'vertical flame flues disposed in upper and lower flue sections operable concurrently, fordownflow combustion and which respectively haverlch fuel gas condu ts and a1r regenerator condults commun catmg therewith at the -9.,In a vertical retort battery for the car-' topsof said sections, adapted for. separately regulating the heatingofsaid sections so that the upper portions of the coking chambers may beregulably heated for coal gas produc-,-

chambers for water gas production in the lower portions thereof; water gas oiftake means communicably connected'with the coking chambers below said distillate-gas offtake means and above said means for introducing steam, and adapted for oiftakefrom said coking chambers, separately from and independently of gasoff-flow through the distillate gas ofl'ta'ke means for the coking chambers, of

water-gas produced in the lower portions of; said coking chambers from said steam; and

means for leading water gasfrom said watergas ofi'take means to the rich fuel gas con-' duits for said upper and lower flue sections of each of the heating walls for combustion in the flues of said sections.

10. In a vertical retortbattery for the carbonization of coal, in combination; apIuraht of slde-by-slde continuous vertical coking chambers each adapted to receive through its top substantially continuously the-charge to be coked and to discharge through its bot:

tom substantially continuously the coked charge; heating walls therefor betweenand contiguous to said cokingchambers, each of said heating walls comprising upperand lower sets ofvertical flues communicably connected with each other for passage ofcombustion products from one to the other; duct means commun eably connecting the flues in each of said heatlng walls with the flues in "another ofthe heating walls, said duct means being in communication with the lower ends of the. lower sets of flues of'the heating walls they respectively; connect; paired regenerators' having connections separately communi'cat ing with the flame flues of the heatingwalls, respectively, the connections of said regenerators-providing separate ducts for and in communicationwith the tops of the upper and the lowersets of flues; distillate-gas 0ff-.

take means communicating with said coking chambers at their upper endsfor collecting gases of distillation therefrom; means for introducinga fluid medium into the lower endsof said cokingchambers to react with incandescent coke therein to form a lean combustible gas; lean gas oiftake means in communication with said coking chambers be low said distillate gas ofltake means and above said means for introducing a fluid medium and adapted for oiitake from said coking chambers, separately from and independently of gas ofi-fiow through the distillate-gas offtake means for the coking chambers, of said lean combustible gas; and means for leading gas from said lean gas oiftake means directly to the upper ends of the upper and lower sets of vertical flues of said heating walls.

11. In a vertical retort battery for the carbonization of coal, in combination: a plurality of side-by-side continuous vertical coking chambers each adapted to receive through its top substantially continuously the charge to be coked and to discharge through its bottom substantially continuously the coked charge; heating walls therefor between and contiguous to said coking chambers and respectively comprising combustion fines; regenerators communicably connected with the combustion flues of the respective heating walls; one of the heating walls for one of said coking chambers having its combustion fines disposed in upper and lover flue sections which respectively have fuel gas conduits and air regenerator conduits, adapted for separately regulating the heating of said sections so that the upper portions of the col:- ing chamber may be regulably heated for coal gas production and the lower portions for production of a leaner gas formed by reaction of incandescent coke in said retorts with a fiuid medium introduced therein; distillategas ofitake means communicably connected with the upper portions of said coking chamher for ofitake of coal-gases of distillation at the upper parts of said coking chamber; means for introducing a fluid medium into the lower portions of said coking chamber for reaction with incandescent coke therein to produce a leaner gas than coal gas in the lower portions of saidcoking chamber; and lean gas ofitake means communicably connected with said'coking chamber below said distillate-gas oii'take means and above said means for introducing a fluid medium and adapted for oii'take from said coking chamber, separately from and independently of gas off-flow through the distillate-gas offtake means for the said coking chamber, of leaner gas produced in the low-er portion of said coking chamber from said fluid medium.

12. In a vertical retort battery for the carbonization of coal, in combination: a plurality of side-by-side continuous vertical coking chambers each adapted to receivethrough its top substantially continuously the charge to be coked and to discharge through its bottom substantially continuously the coked charge; heating walls therefor between and contiguous to said coking chambers and respectively comprising combustion fiues; one of the heating walls for one of said coking chambers having its combustion flues dis in said retorts with a fluid medium introduced therein; distillate-gas ofitake means communicably connected with the upper portions of said coking chamber for ofitake of coalgases of distillation at the upper parts of said coking chamber; means for introducing a fluid medium into the lower portions of said coking chamber for reaction with incandescent coke therein to produce a leaner gas than coal gas in the lower portions of said coking chamber; and lean gas otltake means communicably connected with said coking chamber below said distillate-gas ofttake means and above said means for introducing a fluid medium and adapted for ofitake from said coking chamber, separately from and independently of gas off-flow through the distillate-gas otftake means for the said coking chamber, of leaner gas produced in the lower portion of said coking chamber from said fluid medium.

In witness whereof, I have hereunto set my hand.

JOSEPH VAN ACKEREN. 

